So... shoutbox...

[Cudamine]

    * Go to "modules" section and to the tab "uploaded modules". Install the shoutbox module, either one of them or both
    * Go back to the blocks, either modify the older "shoutbox" block(now as a "blank" block) or create a new. In both cases choose the type as "TP module"..the last of the list there. Save and then edit again, this time a list of installed modules should appear for you too choose
    * Choose the shout module you like and save
    * Check that the block render the shoutbox

Fresh install of SMF, with TinyPortal, step 1 is fine, shoutbox module installed, I then select "Tp Module", save the page, go back in, and still no Shoutbox in the drop down...

[G6Cad]

Did you activate the block ?